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Proof step 16 from proof reachable-split-last (previous step)

path(r ' + x1, H) ∧ H[(r ' + x1).last].nxt = r0 ∧ r0 ∈ H ∧ r0 ≠ null, r0 ∈ H ⊦ r = r0, reachable(r, (r ' + x1).last, H) ∧ H[(r ' + x1).last].nxt ≠ null

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Proof step 17:
path(r ' + x1, H), H[(r ' + x1).last].nxt ∈ H ⊦ r = H[(r ' + x1).last].nxt, H[(r ' + x1).last].nxt = null, reachable(r, (r ' + x1).last, H)

Proof step 16 from proof reachable-split-last (previous step)

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

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